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Experiments on Sulfur Transformation and Desulfurization with Calcite in O2/CO2 Coal Combustion

Author: JiangWei
Tutor: XuMingHou
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Coal O2/CO2 combustion Sulfur Calcination and Sintering Particulate matter
CLC: X701.3
Type: Master's thesis
Year: 2011
Downloads: 57
Quote: 0
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Abstract


O2/CO2 combustion is a new technology that can achieve carbon capture and storage and control pollutants such as SO2、NOX and particulate matter cooperatively. Currently precursor sulfur emission and transformation mechanism during combustion and SO2 control after combustion is not well understood. For a better understanding, the paper focuses on the above questions. Firstly, research the organic sulfur and inorganic sulfur transformation under CO2 atmosphere is taken; Further, this paper focus on limestone calcinations and sintering characteristic under O2/CO2 atmosphere. Finally, Using a drop tube furnace to research injection limestone desulfurization efficiency as well as impact on the particulate matter control under O2/CO2 atmosphere.Firstly, Liuzhi high pyritic sulfur coal and Zunyi high organic sulfur coal were chosen to do systematic research about sulfur transformation under CO2 atmosphere. Experimental results show that there are two ways of pyretic sulfur transform into organic sulfur during thermal chemical conversion process. One is the activity S2 which is decomposed from pyretic sulfur react with char to form organic sulfur. The other one is that FeSx （1≤x<2） decomposed from pyretic sulfur react with organic functional groups in char to form organic sulfur. H2S,SO2 and CS2 are the main gaseous products that containing sulfur under CO2 atmosphere.SO2 is mainly produced by decomposition of sulfates. CS2 emission is likely relation to pyretic sulfur content. COS can be detected under CO2 atmosphere while can not be detected under N2 atmosphere.Secondly, Using thermal gravity and drop tube furnace to research impact of temperature, CO2 partial pressure and atmosphere on limestone calcinations and sintering characteristics of CaO. The results show that, compared with O2/N2 atmosphere, decomposition temperature is higher and decomposition rate is slower under O2/CO2 atmosphere. CO2 partial pressure affect limestone decomposition temperature. During 900-1300℃, specific surface area and porosity increased first and then decrease under O2/N2 atmosphere while they increase during temperature rise under O2/CO2 atmosphere.Finally, Using drop tube furnace to research injection limestone desulfurization efficiency as well as impact on the particulate matter control under O2/CO2 atmosphere. The results show that SO2 emission is lower under O2/CO2 atmosphere than O2/N2 atmosphere. The desulfurization mechanism is changed from indirect desulfurization mechanism under O2/N2 atmosphere to indirect desulfurization mechanism and direct desulfurization mechanism under O2/CO2 atmosphere. The best desulfurization temperature under O2/CO2 atmosphere is wider than O2/N2 atmosphere. What’s more, inject limestone is not only achieve SO2 control as well as PM10 especially PM1 control under O2/CO2 atmosphere coal combustion.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization > Desulfurization and desulfurization
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